MOLECULAR POLARITYFIELD NOTE 56 / 175

Is C7H6O3 polar or nonpolar?

Salicylic Acid (C7H6O3) is polar because its adjacent COOH and phenolic OH groups make the ring strongly asymmetric.

THE ANSWERPolar.

Salicylic Acid · planar aromatic ring and carboxyl C

FIGURE 01

The molecule in space

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STRUCTURE / 01
O ×3C ×7H ×6
OHHOHCCHCCCCCHHO
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01 / MODEL RECORDPubChem 3D coordinates. Atom sizes and bond thickness are illustrative.How model data is used ↗

THE REASONING

Why C7H6O3 is polar

Salicylic acid is 2-hydroxybenzoic acid, with an –OH next to a –COOH group on the benzene ring. Both oxygen-containing substituents contribute to its polarity.

A USEFUL DISTINCTION

What to notice

The nearby OH and carbonyl O can form an intramolecular hydrogen bond in some conformers; that changes the observed 3D pose, not the atom connectivity.

QUICK REFERENCE

Common questions about C7H6O3

  1. 01
    What does the Lewis structure of C7H6O3 show?

    The benzene ring bears adjacent –OH and –C(=O)OH groups. The carboxyl carbon is planar and each oxygen carries lone pairs.

  2. 02
    What is the molecular geometry of C7H6O3?

    C7H6O3 has a planar aromatic ring and carboxyl C molecular geometry. The 3D model shows representative bond angles of 109.1° and 111.9° and 120°. These angles come from the displayed model coordinates.

  3. 03
    What is the molar mass of C7H6O3?

    C7H6O3 has an approximate molar mass of 138.12 g/mol, calculated from its formula using abridged standard atomic weights. Natural isotope variation can change the last digits.

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